gone

Terminal locking utility with many improvements over lock(1)

Gone is a utility that locks a terminal with a password chosen by the user. Gone will prompt the user for a password (unless the -p option is given, then gone will use the system password), then print the gone banner, then drop into the gone shell. From this shell, only a restricted set of commands can be run. Gone will also disallow messages by removing permissions on the parent tty. After the timeout period (10 minutes by default), gone will automatically log the user out. -Joe marcus@marcuscom.com